Cross-Platform Visitor Registration App

I need a registration app for both iOS and Android platforms. The app will be used to register visitors and should include the following features:

- QR code scanning: For quick and easy visitor check-in.
- Photo capture: To take a photo of the visitor for identification purposes.
- User authentication: To ensure secure access and maintain visitor privacy.

Ideal Skills and Experience:
- Proficiency in mobile app development for both iOS and Android.
- Experience with integrating QR code scanning and photo capture functionalities.
- Strong background in implementing secure user authentication mechanisms.
- Familiarity with UI/UX design principles to create an intuitive user interface.

Please provide a portfolio showcasing similar projects.